This thesis mainly pertains biproduct decompositions of objects in certain additive
categories that exhibit a peculiar regular behaviour. More precisely, in certain additive …

Every vector space over a field K is the direct sum of a number of copies of the
onedimensional K-vector space K. Allowing scalars to be elements of a ring R instead of a …

Every vector space over a field K is the direct sum of a number of copies of the
onedimensional K-vector space K. Allowing scalars to be elements of a ring R instead of a …